Search the dictionary A Chinese word or character, or English Draw a character Search 4 entries. mìdìng 嘧啶 pyrimidine C4H4N2 bāomìdìng 胞嘧啶 cytosine nucleotide (C, pairs with guanine G 鳥嘌呤|鸟嘌呤 in DNA and RNA) niàomìdìng 尿嘧啶 uracil nucleotide (U, pairs with adenine A 腺嘌呤 in RNA) xiōngxiànmìdìng 胸腺嘧啶 thymine nucleotide (T, pairs with adenine A 腺嘌呤 in DNA)